-Prison, that would do it.
-When all paint and writing utensils fall off the face of the earth.
-Death, that would do it.
if you truely have a passion for graffiti(night time activity), that kinda bullshit(school,work) wouldn't stop you. If you doing it cause your in the "now" and your friends/peers got you into it, and when you stop writing, giving an excuse for yourself(Right there, you proved you write to fit in with that crowd at the time, otherwise you dont need an excuse)<<it's for you, its for other writers, if you dont NEED to do it, then dont fucking do it. ya know?<<for real, i hear peeps talking about it as if its a chore.